GB2239820A

GB2239820A - Dialysis unit

Info

Publication number: GB2239820A
Application number: GB9025474A
Authority: GB
Inventors: Leonard Drysdale Chamberlain; Donn Douglas Lobdell
Original assignee: Cobe Laboratories Inc
Current assignee: Terumo BCT Inc
Priority date: 1989-11-22
Filing date: 1990-11-22
Publication date: 1991-07-17
Anticipated expiration: 2010-11-22
Also published as: JP2542728B2; GB9025474D0; JPH03173570A; IT1241624B; FR2654626B1; FR2654626A1; DE4031613C2; US5041215A; PT94155A; GB2239820B; CA2016863C; CA2016863A1; DE4031613A1; IT9067717A1; IT9067717A0

Description

4 1 - DIALYSIS UNIT This invention relates to dialysis units. Our

preferred embodiment described below provides improved saline disposal.

It is known to prime a dialysis unit with saline, connecting a tubing set between a saline bag and a waste bucket.

We have now devised a dialysis unit which may provide for saline disposal through conduits of the unit.

According to the invention, there is provided a dialysis unit comprising a drain configured to sealingly cooperate with a tubing set.

In preferred embodiments, a drain is selectively cooperative ' with an ordinary operating hydraulic circuit and a saline priming circuit; the ordinary operating circuit includes a handle longitudinally and rotationally movable between a position implementing the ordinary operating hydraulic circuit and a position implementing a saline priming circuit; the saline priming circuit includes a cap selectively engageable with the drain; and both circuits include means to create vacuum therethrough.

The presently drawings, and its In the drawings:- Fig. 1 is an several respects, of dialysis unit; preferred embodiment is shown in the strupture and operation then described.

end elevation view, broken away in of the presently preferred embodiment Fig. 2 is a somewhat diagrammatic view of, a portion of said embodiment; Fig. 3 is a view, partially broken away, of a portion of the portion shown in Fig. 2; and Fig. 4 is a vertical sectional view through upper portions of the portion shown in Fig. 2.

Turning now to the drawings, there is indicated generally at 10.a-dialysis-unit. - Mounted on the control panel portion of the dialysis unit 10 by means-not shown is waste handling housing 12, which is shown in Figs. 2 and 3, somewhat diagrammatically, as hav ing its panel contact rim 14 at an angle, while in fact the rim lies in a vertical plane, for engagement therein with the control panel portion above mentioned.

llandle 16 is fixedly secured to shaft 18 which is axially movable relative to bushing 20 mounted on housing 12.

Shaft 18 is biased toward housing 12 by spring 22, which is compressed between bushing 20 and washer 24 supported by-snap ring 26 carried in a groove in shaft 18.

Bushing 20 has within it camming surfaces (not sno,,m) which cooperate with pins on shaft 18 (not shown) to rotate handle 16 so as to align the axes of valve unit 54 and drain 32, when the handle is not prevented from such movement (as, by insertion of a cap 44 in the drain).

Snap ring 28, carried in a groove in bushing 20, retains bushing 20 in housing 12.

z> Also retained in housing 12, by snap ring 30 in a groove therein is drain 2-,, which includes integrally portion 34,.a slightly smaller diameter portion 38, a frustoconical portion 40, and a smallest diameter portion 36. Internally, drain 32 contains a counterbord-in which seats scaling fin 42 of priming cap 44. The hole in drain 32 adjacent said counter bare is of diameter to sealingly accept scaling fins 46 of cap 44, and of depth so that the end 48 of cap 44 does not reach it.

1 i i 1 Handle 16 is-an integral plastic piece carrying three holes. One, counterbored. shown in Fig. 4, carries stem 18. Hole 50, 1/8 inch (0. 3175cm) in diameter, connects the hole from stem 18 with hole 52 through valve unit indicated generally at 54.

Hole 50 is done by-drilling, followed by plugging the hole so as to produce--the imperforate wall 56 as shown in Fig. 4.

Cap 44, as best shown ill Fig. 3, is Dowlex 2535 LLDPE injecLion,molded in one piece. Longitudinal portion 84 has extending through its length a hole, defined by two female luer portions intersecting longitudinally centrally thereof. Luer threads 86, 88 are provided. Loop 90 permits hanging; oil IV poles. There is provided breaLlier cap portion 92, with longitudinal grooves and a pair of noLched fins which in combination force air. to make three 90' Lurns. There are also a pair of catches 94.

Referring-now to Fig. 2, from drain 32 exLends tubing 96, into check valve 98, from which Lubing 100 extends to check valve 102, from which tubing 104 extends into Lhe sidearm of venturi 106.

The lower end of shaft 1.8 is connected into tubing 108, which extends to tee 110, connected also by tubing, 112 to venturi 106.

Valve unit 54 incltides plastic body 53 wi'Lli circumfer entia groove 60 carrying circumferential lip 62 of silicone rubber boot 82, circumfcr'eitial lip 64 of which is seated in circumferential gro.ove 66 of stem 68. The sLem 68 is of ABS plastic, and includes the larger portion 70 which carries groove 66, the smaller diameter portion 72 which e%tcnds for most of its length, and circumferential groove 74 in which is seated 0 ring 76, which in turn is seated in chamfer 78. Sprinc.; 80 is compressed between surface 83 of body 58 and surface 84 of stem - 4 68. The boot 82 has a thickness between lips of 1/64 of an iuch. A right-angled hole with portions 85a and 85b is provided in stem 68.

is In use, fluid-constantly flows through dialysis unit 10, whether for example water, dialysate, or bleach. This effluent constantly moves through tee 110. tubing 112, venturi 106, and out through exit conduit not shown.

Except when it is desired to prime, by filling di alyzer and tube set with saline, valve unit 54 (Fig. 3) is seated in place in drain 32. The action of spring 22 in pulling liandle 16.-dovn causes. the lower surface of stem 72 to engage the counterbore in drain 32 already referred to and move up stem 72, moving 0-ring 76 out of valving with cliamfer 78.

The vacuum pulled in the sidcarm of venturi 106 by the flow through it already mentioned then draws a portion of thal flow through tfie iool) consisting of, successively, ice 110, tubing 108, stem 18, handle 16 through the open valve unit 54, down the drain 32, continuing with tubing 96, clieck valve 98, tubing 100, check valve 102, tubing 104, through venturi 106 to mingle with mainstream effluent. In this mode of operation, no cap 44 (which would prevent Llic rocational stem liSI 1-,iovetliciit: above mentioned) is in,placc.

When saline priming is desired, liallrlle 16 is moved upinsertion of cap 41.t, as ward by hand, and rotated o permit stio.iii in Fig. 3. This, through the action of sprin,, 80, no longer overridden by the drain counlerborc surface above men 0 tioned, cleses the 0-ring 76 valve in valve unit 54 and stops flow in the circuit above enumerated.

Desirably, tube sets arc provided willi at lasl one cap 44 already in place, for insertion as above dcscrib,-d.

1 1 11 The other end is then spiked into a saline bag (preferably using as a connector, although its other functions are there irrelevant, a cap 44). Saline is then drained through that portion of the loop above enumerated between drain 32 and the sidearm of.venturi 106.

The invention thus provides for c.lean, easy, and safe disposal of waste saline.

Inclusion as described of the vacuum means insures that whenever.there.is a change from priming mode to other mode, or the reverse, the downstream line to which connection is selectively made is empty.

Contamination between patients is prevented by a number of features. During priming, the blood pump turns backward, so that pressure is adverse to backflow into the tubing set. Further insurance thereagainst is provided by check valves 98 and 102... The cap 44 used to connect a tubing set to the drain is to be used oilly once. Even if by rilistake it is used a second time, its configuration as abov described prevents contamination. Because of the fins 46 and the spacing of the end 48, the fluid passages of the tubing set are- never in contact with the dialysis unit 10. The entire fluid circuit is cleaned and disinfected after each patient.

Other eiiibodir;,eiit:.,,; are. f(,a.siblp.

1 The vacuum means may be, for ail orifice plate rather than a venturi.

M

Claims

1. A dialysis unit comprising a drain conf igured to sealingly cooperate with a tubing set.

2. A dialysis unit comprising a unit according to Claim 1 in combination with a said tubing set, which tubing set carries a cap for sealingly cooperating with said drain.

3. A unit according to Claim ' 2, in which said cap includes a central conduit portion and a pluralityof sealing fins therearound.

4. A unit according to Claim 3, in which said cap includes around said portion a stop for cooperating with said drain to longitudinally position said stop in said drain.

5. A unit according to Claim 4, in which said stop positions said cap so that an inner end of said conduit portion is spaced from and out of contact with -said drain.

6. A unit according to any of Claims 2 to 5, in which said cap is integrally,constituted of plastics.

7. A unit according to any preceding claim, which includes also an operating mode connector selectively sealingly engageable with said drain.

8. A unit according to Claim 7, in which said connector is externally configured as a handle.

9. A unit according to Claims 7 or 8, in which said connector is longitudinally and circumferentially movable relative to the rest of said unit.

1 - 7

10. A unit according to any preceding claim, in which said drain is in a first fluid circuit portion including a main effluent passage of said unit.

11. A unit according to Claim 10,.in which said first fluid circuit portion includes vacuum means adapted operatively to apply a reduced pressure to said drain.

12. A unit according to Claim 11, in which said vacuum means is a venturi situated in said main effluent passage and with a sidearm in fluid communication with said drain.

13. A unit according to Claim 7 or any claim appendant thereto, in which said connector includes a valve unit.

14. A unit according to claim 13, in which said connector is a part of a fluid circuit portion including passage mgans through said valve unit and from said valve unit.

15. A unit according to Claim 14, in which said valve unit includes means engageable with said drain for opening a valve in said valve unit when said valve unit is introduced into said drain.

16.. A unit according to Claims 14 or 15, in which said valve unit includes an elastomeric boot engageable with said drain.

17. A unit according to both Claim 10 and one of Claims 14, 15 or 16, in which said second mentioned fluid circuit portion is connected into said main effluent passage.

18. A unit according to Claim 10, which includes at least one cheek valve oriented to prevent movement of fluid toward said drain.

19. A dialysis unit substantially as hereinbefore described with reference to and as shown in the accompanying drawings.

1 Published 1991 atThe Patent Office. State House. 66/71 High Holbom. LondunWCIR47P. Further copies may be obtained from Sales Branch, Unit 6, Nine Mile PbinL Cwmfelinfacb, Cross Keys. Newport. NPI 7HZ. Printed by Multiplex techniques lid. St Mary Cray, Kent.